Testing device for accurately measuring distributed radial refractive index distribution of optical fiber

Abstract

The invention discloses a testing device for accurately measuring the distributed radial refractive index distribution of an optical fiber. The device comprises a signal unit, an interference device,a transmission unit and a processing system, wherein the signal unit is used for outputting a rectangular pulse optical signal which is discontinuous polarized light with a pulse interval; the interference device is used for applying external interference to the distributed radial direction of the to-be-measured optical fiber; the transmission unit is used for transmitting the rectangular pulse optical signal to theto-be-measured optical fiber and transmitting a backward Rayleigh scattering signal of the to-be-measured optical fiber to the processing system; and the processing system is used for analyzing the backward Rayleigh scattering signal and calculating the distributed radial refractive index distribution of the to-be-measured optical fiber in the length direction according to the action feedback of the interference device. The distributed radial refractive index distribution of the optical fiber can be accurately obtained under the condition of simulating external environment interference, the quality of the optical fiber can be accurately evaluated, an important parameter basis is provided for subsequent research based on the optical fiber, and the distributed radial refractive index distribution measurement of the optical fiber has very high accuracy.

Description

technical field [0001] The invention relates to the technical field of distributed optical fiber sensing, in particular to a test device for accurately measuring the distributed radial refractive index distribution of optical fibers. Background technique [0002] With the continuous development of technology in the field of distributed optical fiber sensing, the demand for the length of the optical fiber is increasing. With the increase of the length of the optical fiber, the radial distribution of the optical fiber refractive index appears during the drawing process and the cable forming process. The change will seriously affect the application effect of optical fiber distributed sensing. By measuring the characteristic parameters of the optical fiber, the quality of the optical fiber can be evaluated, which is helpful for the optimal design and manufacture of the optical fiber. Refractive index distribution is one of the important characteristic parameters of optical fibe...

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